Whether it may be found or not is irrelevant. We don't depend on finding intelligent life to help us, they could just as likely kill us, we depend on finding about our origins and what could happen to the planet, in the short, medium and long term. In the long term we are pretty certain the Sun will burn the Earth to a crisp. So there is no infinity to it at all. In the short and medium term we are dealing with issues of global warming, sustaining a growing population and finding energy sources. We also have to prepare for the possibility of an asteroid collision. This isn't science fiction or a Hollywood movie, but real events. A manned mission to a nearby asteroid is planned in the 2020's to determine it's composition and what can be done to deflect or destroy similar sized bodies, of which some come very close to us as soon as the 2030's. This is also when we are planned to attempt a Mars landing. I can see why some religious figures would not want to find other life or expand our horizons, that scares them, science often contradicts them. No god is deflecting asteroids that can wipe out entire species, we will do that with technology, then it is up to people to have faith in what they believe in. Which is why I don't think a closed minded attitude is the way forward. If a god really does exist then surely they gave us this intelligence to help ourselves, debating how it is done is the only issue. Isn't Islam the religion of science after all? Arabic astronomers were leaders in the field, Muhammed himself is an apparent philosopher in this area, looking at nature rather than superstition or belief. The Quran is one of the leading religious texts in reference to the Universe and it's creation. Putting a wall in front of the advancement of the human race is a death sentence, you evolve or die, a lot of the science that goes into companies like NASA and the ESA comes back into society and directly benefits society and the planet, remember they are not just looking at other planets but constantly monitoring our own. When you consider NASA's $15Bn annual budget it is peanuts in comparison to the figures that are spent in other areas. The US military has spent 75 times that amount since 2001.
The capacity of Earth is simply not unlimited, there is only so much land and space, and providing food and energy is the biggest problem. People can live pretty much anywhere, up in the sky, in bunkers, on mountains, anywhere with air, energy, shelter and food. By 2050 the population of Earth could be close to double what it is now. We have to make changes and will make changes to combat that. A lot of people probably won't like those changes either. I agree with what you say about the monopolizing of resources, and this is the big change that has to happen.